Table 2 Summary of risk of bias assessment
Studies | Cochrane collaboration tool | ||||||
|---|---|---|---|---|---|---|---|
Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective outcome reporting | Other sources of bias | |
Li [10] | Low risk | Low risk | Unclear risk | Low risk | Low risk | Unclear risk | Unclear risk |
Phakdeekitcharoen [16] | Unclear risk | Low risk | Unclear risk | Low risk | High risk | Unclear risk | Unclear risk |
Reyes-Marin [20] | Unclear risk | Low risk | Unclear risk | Low risk | Unclear risk | Unclear risk | Unclear risk |
Suzuki [11] | Unclear risk | Unclear risk | Low risk | Low risk | Unclear risk | Unclear risk | Unclear risk |
Suzuki [15] | Low risk | Low risk | Unclear risk | Low risk | Unclear risk | Unclear risk | Unclear risk |
Shigenaga [19] | Unclear risk | Unclear risk | Unclear risk | Low risk | Unclear risk | Unclear risk | Unclear risk |
Zhong [18] | Low risk | High risk | Unclear risk | Low risk | High risk | Unclear risk | Unclear risk |
Wang [17] | Low risk | Unclear risk | Unclear risk | Low risk | High risk | Unclear risk | Unclear risk |